At what distance will two magnets attract each other ? We have exper imented with a small magnet and we cannot find anything to place between the magnets to prevent them attracting each other. A. Magnetic induc tion takes place through all substances independ ent of theircharacter or composition. This induc tion decreases as the square of the distance. ceived from the following correspondentsand examined with the results stated : J. T. is A. is frank finite a mineral consisting mainly of the sesquiox ides of iron and manganese combined with the protoxides of zinc and
At what distance will two magnets attract each other ? We have exper imented with a small magnet and we cannot find anything to place between the magnets to prevent them attracting each other. A. Magnetic induc tion takes place through all substances independ ent of theircharacter or composition. This induc tion decreases as the square of the distance. ceived from the following correspondentsand examined with the results stated : J. T. is A. is frank finite a mineral consisting mainly of the sesquiox ides of iron and manganese combined with the protoxides of zinc and iron. The attempts to work it for zinc have proved unsuccessful ; but it L9 ground up to a dark paint and can be used also as an ore of iron. The zinc is said to give in creased tenacity to the H. number of specimens of black oxide of manganese have been received and all have been reported upon; golf yours was not reported upon it has not been S. is a part of a trap column the angle between two of the faces in the speci It is a silicate of alumina iron magnesia lime potash and soda. It is not L. R. C It is iron pyrites some of it in cubic crystals. Not valuable as an iron P. is prehnite which is a silicate of alumina and lime (the green ish portion) in traps. It is not an ore. The mag netic action is due to a slight percentage of iron oxide in the R. is a water-rolled mass of fragments of feathers of waterfowl and A. is rock crystal. It is of little value except when in line clear crystals. It is very common in many parts of the Is probable that the substance found is not quick silver. Send a are iron and copper pyrites specimen being richer in copper. The reduced metal is mostly black proto sulphide of irob together with some sulphide of copper and carbon derived from the fuel. The iron ladle is covered with metallic iron and a little
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